diff options
Diffstat (limited to 'ml/dlib/dlib/lzp_buffer/lzp_buffer_kernel_1.h')
| -rw-r--r-- | ml/dlib/dlib/lzp_buffer/lzp_buffer_kernel_1.h | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/ml/dlib/dlib/lzp_buffer/lzp_buffer_kernel_1.h b/ml/dlib/dlib/lzp_buffer/lzp_buffer_kernel_1.h deleted file mode 100644 index f24d74eee..000000000 --- a/ml/dlib/dlib/lzp_buffer/lzp_buffer_kernel_1.h +++ /dev/null @@ -1,236 +0,0 @@ -// Copyright (C) 2005 Davis E. King (davis@dlib.net) -// License: Boost Software License See LICENSE.txt for the full license. -#ifndef DLIB_LZP_BUFFER_KERNEl_1_ -#define DLIB_LZP_BUFFER_KERNEl_1_ - -#include "../algs.h" -#include "lzp_buffer_kernel_abstract.h" - -namespace dlib -{ - - template < - typename sbuf - > - class lzp_buffer_kernel_1 - { - /*! - REQUIREMENTS ON sbuf - sbuf is an implementation of sliding_buffer/sliding_buffer_kernel_abstract.h - T == unsigned char - - INITIAL VALUE - - buffer.size() == the size as defined by the constructor - - table_size == the number of elements in the table array - - for all i: buffer[i] == 0 - - for all i: table[i] == buffer.size() - - CONVENTION - - table_size == the number of elements in the table array - - size() == buffer.size() - - operator[](i) == buffer[i] - - - if (table[hash()] != buffer.size()) then - - buffer.get_element_index(table[hash()]) == the index we will - predict for the current context - - else - - there is no prediction for the current context - - - last_element == buffer.size()-1 - - - This is LZP with just an order-3 model without context confirmation. - - !*/ - - public: - - explicit lzp_buffer_kernel_1 ( - unsigned long buffer_size - ); - - virtual ~lzp_buffer_kernel_1 ( - ); - - void clear( - ); - - inline void add ( - unsigned char symbol - ); - - inline unsigned long predict_match ( - unsigned long& index - ); - - inline size_t size ( - ) const; - - inline unsigned char operator[] ( - unsigned long index - ) const; - - private: - - inline unsigned long hash ( - ) const - /*! - ensures - - returns a hash computed from the current context. This hash - is always in the range for table. - !*/ - { - unsigned long temp = buffer[0]; - temp <<= 16; - unsigned long temp2 = buffer[1]; - temp2 <<= 8; - unsigned long temp3 = buffer[2]; - temp = temp|temp2|temp3; - - temp = ((temp>>11)^temp)&0xFFFF; - - return temp; - } - - sbuf buffer; - const unsigned long table_size; - unsigned long* const table; - unsigned long last_element; - - // restricted functions - lzp_buffer_kernel_1(const lzp_buffer_kernel_1<sbuf>&); // copy constructor - lzp_buffer_kernel_1<sbuf>& operator=(const lzp_buffer_kernel_1<sbuf>&); // assignment operator - - }; - -// ---------------------------------------------------------------------------------------- -// ---------------------------------------------------------------------------------------- - // member function definitions -// ---------------------------------------------------------------------------------------- -// ---------------------------------------------------------------------------------------- - - template < - typename sbuf - > - lzp_buffer_kernel_1<sbuf>:: - lzp_buffer_kernel_1 ( - unsigned long buffer_size - ) : - table_size(65536), - table(new unsigned long[table_size]) - { - buffer.set_size(buffer_size); - - for (unsigned long i = 0; i < buffer.size(); ++i) - buffer[i] = 0; - - for (unsigned long i = 0; i < table_size; ++i) - table[i] = buffer.size(); - - last_element = buffer.size()-1; - } - -// ---------------------------------------------------------------------------------------- - - template < - typename sbuf - > - lzp_buffer_kernel_1<sbuf>:: - ~lzp_buffer_kernel_1 ( - ) - { - delete [] table; - } - -// ---------------------------------------------------------------------------------------- - - template < - typename sbuf - > - void lzp_buffer_kernel_1<sbuf>:: - clear( - ) - { - for (unsigned long i = 0; i < buffer.size(); ++i) - buffer[i] = 0; - - for (unsigned long i = 0; i < table_size; ++i) - table[i] = buffer.size(); - } - -// ---------------------------------------------------------------------------------------- - - template < - typename sbuf - > - void lzp_buffer_kernel_1<sbuf>:: - add ( - unsigned char symbol - ) - { - buffer.rotate_left(1); - buffer[0] = symbol; - } - -// ---------------------------------------------------------------------------------------- - - template < - typename sbuf - > - unsigned long lzp_buffer_kernel_1<sbuf>:: - predict_match ( - unsigned long& index - ) - { - const unsigned long i = hash(); - - if (table[i] != buffer.size()) - { - index = buffer.get_element_index(table[i]); - - if (index > 20) - { - // update the prediction for this context - table[i] = buffer.get_element_id(last_element); - } - return 3; - } - else - { - // update the prediction for this context - table[i] = buffer.get_element_id(last_element); - return 0; - } - } - -// ---------------------------------------------------------------------------------------- - - template < - typename sbuf - > - size_t lzp_buffer_kernel_1<sbuf>:: - size ( - ) const - { - return buffer.size(); - } - -// ---------------------------------------------------------------------------------------- - - template < - typename sbuf - > - unsigned char lzp_buffer_kernel_1<sbuf>:: - operator[] ( - unsigned long index - ) const - { - return buffer[index]; - } - -// ---------------------------------------------------------------------------------------- - -} - -#endif // DLIB_LZP_BUFFER_KERNEl_1_ - |